Hi,

Sorry for posting this here and not in Jira (factors outside my control 
necessitate me posting here). Maybe my interpretation of the semantics of 
parquet::SetArrayBit is off, but I was surprised to find SetArrayBit(bits, i, 
false) does not clear bit i. I just wanted to mention it in case that wasn't 
the behavior that was intended and is a bug.

from bit-util.h
  static inline void SetArrayBit(uint8_t* bits, int i, bool is_set) {
    bits[i / 8] |= (1 << (i % 8)) * is_set;
  }





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